FloppusMaximus: ILine

2013-10-20T18:58:56Z

ILine

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[[Category:84PCSE:BCALLs:By Name|ILine]] [[Category:84PCSE:BCALLs:By Name:Drawing|ILine]] [[Category:84PCSE:BCALLs:By Address|47CB - ILine]]
== Synopsis ==
'''Hypothesized Official Name:''' ILine

'''BCALL Address:''' 47CBh

Draw a line.

=== Inputs ===
* DE = starting pixel X coordinate
* C = starting pixel Y coordinate (from bottom of screen)
* HL = ending pixel X coordinate
* B = ending pixel Y coordinate
* A = operation to perform on line (see below)
* ([[84PCSE:RAM:A038|penFGColor]]) = RGB color to draw to LCD
* ([[84PCSE:RAM:A03A|penFGColorIndex]]) = Color index to store in graph buffer
* [[84PCSE:Flags:2B#Bit_2|fullScrnDraw, (iy + apiFlg4)]] = 1 to use LCD coordinates; 0 to use graph coordinates
* [[84PCSE:Flags:02#Bit_1|plotLoc, (iy + plotFlags)]] = 1 to draw to LCD only; 0 to draw to LCD and graph buffer
* [[84PCSE:Flags:14#Bit_5|g_style_active, (iy + sGrFlags)]] = 1 to draw "fancy" dots for graphing

=== Outputs ===
* ([[84PCSE:RAM:9851|9851h]]) = input C
* ([[84PCSE:RAM:9852|9852h]]) = input DE

=== Destroys ===
* [[84PCSE:Hooks:9E85|Drawing hook]] is called
* IX
* ([[84PCSE:RAM:A59E|A59Eh]]), ([[84PCSE:RAM:A5BA|A5BAh]]), ([[84PCSE:RAM:A5BC|A5BCh]]), ([[84PCSE:RAM:A5F6|A5F6h]]), ([[84PCSE:RAM:A5F8|A5F8h]]), ([[84PCSE:RAM:A5FA|A5FAh]]), ([[84PCSE:RAM:A5FC|A5FCh]])

== Comments ==
As for [[84PCSE:BCALLs:47CE|IPoint]]:
* A = 0 will draw a white or transparent line
* A = 1 will draw a line using the current foreground color
* A = 2 will "invert" pixels along the line
* A = 4 will restore pixels from the graph buffer
See IPoint for more details.

84PCSE:BCALLs:47CB - Revision history

FloppusMaximus: ILine